On 2018 August 29, December 14, and December 17, the four Stokes parameters of the spectral lines at 1.56 \(\mu \) m (from 15644 Å to 15674 Å) were recorded using the Tenerife Infrared Polarimeter working with GRIS [1]}, [2]} attached to the German GREGOR telescope [3]}. The data sets were obtained in a quiet
Sun region located at disk center.
The spectral sampling was 40.00 mÅ. A spatial resolution of \(0.5^{\prime \prime }\)  was reached through the
adaptive optics system [4]} locked on granulation.
